tree 71765e0155a40a28aa6966208560a7743bbbf06a
parent d105ef8120dd522c3233a1395ee0b318ed0929e8
author Jia-Ju Bai <baijiaju1990@gmail.com> 1564366129 +0800
committer Vinod Koul <vkoul@kernel.org> 1565271229 +0530

dmaengine: stm32-mdma: Fix a possible null-pointer dereference in stm32_mdma_irq_handler()

In stm32_mdma_irq_handler(), chan is checked on line 1368.
When chan is NULL, it is still used on line 1369:
    dev_err(chan2dev(chan), "MDMA channel not initialized\n");

Thus, a possible null-pointer dereference may occur.

To fix this bug, "dev_dbg(mdma2dev(dmadev), ...)" is used instead.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Fixes: a4ffb13c8946 ("dmaengine: Add STM32 MDMA driver")
Link: https://lore.kernel.org/r/20190729020849.17971-1-baijiaju1990@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>